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Polyphyly of the fern family Tectariaceae sensu Ching:Insights from cpDNA sequence data

Science china(Life sciences) 2007年第6期50卷 789-798页

作者： liu hongmei1,2, zhang xianchun1, chen zhiduan1, dong shiyong3.& qiu yinlong4 1 state key laboratory of systematic and evolutionary botany, institute of botany, chinese academy of sciences, beijing 100093. china 2 Graduate University of chinese academy of sciences, beijing 100039, china 3 South china Botanical Garden, chinese academy of sciences, Guangzhou 510650, china 4 Department of Ecology and evolutionary Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA state key laboratory of systematic and evolutionary botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China

Tectariaceae are a pantropical fern family of about 20 genera, among which 8 are distributed in china. The morphological distinctiveness of the family is widely recognized, yet relatively little systematic research has been conducted on members of Tectariaceae. Phylogenetic analyses of chloroplast DNA sequence data (rbcL; atpB) from 15 species representing all 8 genera in china were carried out under parsimony criteria; Bayesian inference. The phylogenetic reconstructions indicated that the fern family Tectariaceae as traditionally circumscribed are polyphyletic. Ctenitis, Dryopsis, Lastreopsis clustered with; should be included within the newly-defined Dryopteridaceae,; Pleocnemia is also tentatively assigned to it. A narrowly monophyletic Tectariaceae is identified, which includes Ctenitopsis, Hemigramma, Pteridrys, Quercifilix,; Tectaria. In the single rbcL analysis, Arthropteris clustered with the above-mentioned monophyletic Tectariaceae. Although further investigations are still needed to identify infrafamilial relationships within the monophyletic Tectariaceae; to redefine several problematic genera, we propose a working concept here that better reflects the inferred evolutionary history of this group.

关键词： Tectariaceae, polyphyly, rbcL, atpB

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Inclusion of the Eastern Asia endemic genus Sorolepidium in Polystichum (Dryopteridaceae):Evidence from the chloroplast rbcL gene and morphological characteristics

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chinese Science Bulletin 2007年第5期52卷 631-638页

作者： liu hongmei zhang xianchun chen zhiduan qiu yinlong state key laboratory of systematic and evolutionary botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China Graduate University of the chinese academy of sciences Beijing 100039 China Department of Ecology and evolutionary Biology University of Michigan Ann Arbor MI 48109-1048 USA

The taxonomic status of the Eastern Asia endemic Sorolepidium is controversial. Some authors accept it as member of the large diverse genus Polystichum, whereas others suggest that it is an independent genus separated from the later by the exindusiate sorus and the absence of aristate teeth at the pinnae margins. Here we infer phylogenetic relationship of Sorolepidium using DNA sequences of the chloro-plast rbcL gene. Phylogenies were inferred using maximum-parsimony, maximum-likelihood, and Bayesian inference methods. Molecular data establish that Sorolepidium is deeply nested within the large genus Polystichum and has a close relationship with P. duthiei and P. lachenense in the model-based analyses. The Kimura 2-parameter distances of the rbcL sequences between S. glaciale and P. duthiei and P. lachenense were 0.1 and 0.2%, respectively. Furthermore, S. glaciale differed from P. duthiei by a single nucleotide in their rbcL sequences. Close relationships between S. glaciale and P. duthiei and P. lachenense are also supported by the shared spore ornamentation with echinate fenes-trate folds.

关键词：耳蕨玉龙蕨属东亚特有种叶绿体rbcL基因形态特征分类地位

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